This is a PREVIEW FEATURE on Windows* OS. A preview feature may or may not appear in a future production release. It is available for your use in the hopes that you will provide feedback on its usefulness and help determine its future. Data collected with a preview feature is not guaranteed to be backward compatible with future releases. Please send your feedback to firstname.lastname@example.org or to email@example.com.
This collection type uses the hardware event-based sampling collection and system-wide Ftrace* collection (for Linux* and Android* targets)/ETW collection (Windows* targets) to provide a consistent view of the storage sub-system combined with hardware events and an easy-to-use method to match user-level source code with I/O packets executed by the hardware.
The analysis actively relies on the data produced by the kernel block driver system. In case your platform utilizes a non-standard block driver sub-system (for example, user-space storage drivers), IO metrics will not be available in the analysis type.
Use the Input and Output analysis to identify:
Imbalance between I/O and compute operations (HPC applications)
Long latency of I/O requests (transactional workloads)
Hardware utilization (streaming)
Data plane utilization (applications supporting DPDK framework). You can analyze how your application utilizes NIC ports, bandwidth, PCIe, and UPI.
I/O performance issues that may be caused by ineffective accesses to remote sockets or under-utilized throughput of an SPDK device
Knobs:kernel-stack, collect-memory-bandwidth, dram-bandwidth-limits; Linux only: dpdk, spdk.
Run the VTune Amplifier command line interface with administrative privileges (Windows*) or root privileges (Linux*).
Enable system-wide profiling:
For system analysis WITH a target application or process specify your application or process and enable system-wide analysis with the -analyze-system option.
For system analysis WITHOUT a target application or process specify the collection duration with the -duration option.
Example 1: Disk Input and Output Analysis with a Target Application
This example shows how to run the Disk Input and Output analysis with specified Linux target application and enabled system-wide profiling:
amplxe-cl -collect io -knob kernel-stack=true -analyze-system -- /home/test/myApplication
Example 2: SPDK Input and Output Analysis without a Target Application
This example shows how to run a system-wide SPDK Input and Output analysis without specified target application for 30 seconds:
amplxe-cl -collect io -knob kernel-stack=false -knob spdk=true --duration 30
When the data collection is complete, do one of the following to view the result:
Use the -report action to view the data from command line.
Use the -report-output action to write report to a .txt or .csv file